Forum crashes when going to Admin > Users > Registration Queue

Not exactly sure what's going on here. Finally got a stable install set up on Digital Ocean after much fiddling, however every-time I go to access the registration queue for new users the entire thing crashes.

Can anyone help? I've got the error read out from my log file below. Not sure what's happening because it seems to be writing out a scheduled shut down at the end and there's no indication that one of the plugins I'm using is the source of the problem.

I've now got the nodebb-plugin-newuser-approval plugin now installed so hopefully I'll be able to authorise users with that. But I'll get my other admins to help me test it out and see how we go. Would still be nice to have the built in user management functional.

Thanks. Hopefully there isn't a super noob mistake in my set up. This is my first time running a NodeBB forum and also my first time deploying a full Node.js app sooooo yeah. I probably screwed something up but pointers would be great.